Interlayer Bonding Performance And Its Impact On The Asphalt Pavement Stress

With the rapid growth of China’s economy,the transportation industry has also devel-oped rapidly.Faced with the needs of traffic in all over the country,large numbers of bridge have been built,which play an important role in the safety of traffic operations.However,it seriously affects bridges’ performance and safety and results in great economic losses that too many bridges’ structural diseases occur frequently,as the time of use of the bridge in-creased.Therefore,researchers have conducted a lot of research work on the bridge deck pavement system,and have made many remarkable achievements.Nevertheless,the point of research focuses on the selection of pavement materials,the optimization of the mixture and the combination of the structure,etc.By contrast,researches about the combination of layers on the deck pavement system are fewer.For now,multi-layer layered structure sys-tem is widely used for bridges deck pavement system,so,it is one of the important issues to be solved that how to ensure the formation of a close overall bridge deck system.Aiming at the problem of bridge deck pavement in this dissertation,a series of research works is carried out on the combination of the adhesive layer and the waterproof bonding layer from two aspects,the indoor test and numerical simulation.Firstly,the bonding per-formance of adhesive layer and waterproof layer were studied about the effects of different aspects,including bonding materials,temperature and paving structure,by means of indoor drawing,direct shear and oblique shear tests.The research shows that the types of those factors have a significant impact for cohesive layer’s interface destruction resistance ability between adhesive layer and waterproof layer,what’s more,a good interlayer performance is not a performance excellent pavement structure with bonding force strong,but the best combination of the good pavement structure and the adhesive layer material.For three dif-ferent adhesive layer material,material A is more suitable for asphalt and cement concrete layer between the bond(the structure Ⅱ in the paper),material B is more suitable for the asphalt concrete layer between the bond(the structure Ⅰ in the paper),the normal emulsified asphalt is not suitable for the structure Ⅰ and Ⅱ;in this three different waterproof layer material,the material C has the best overall performance,and the performance of material D and material E is difficult to ensure,which should be used carefully.Secondly,the model of bridge structure system is established by using the large-scale general finite element software ABAQUS,aiming to simulate the stress distribution of the different layers in the deck pavement when the vehicle load is action on the pavement.In this paper,five different contact states between the adhesive layer and waterproof layer cal-culated twenty-five different combinations of calculation to discuss the regulation of me-chanical response of each interface with changing interlayer contact state,under the same traffic load.The analysis results show that the mechanical response has obvious difference with the changing of the contact situation between layers.The increasing of adhesive layer friction eoefficient has advantages to reduce the adhesive interface shear and flexural tensile stress,however,only when the waterproof layer friction coefficient is small,it is good for reducing the waterproof and cohesive layer interface shear stress,and only when the water-proof and cohesive layer friction coefficient is large,it is used for declining small water-proof layer interface tensile stress.Furthermore,the increasing of waterproof layer friction coefficient is advantageous to reduce the adhesive interface layer bending tensile stress,but only when the sticky layer friction coefficient is large,it would reduce the adhesive inter-face shear stress;the shear stress of the waterproof layer interface decreased first and in-creased after,besides,the bending tensile stress shows a linear decrease.